The price of the glove is US$37 (approx £21) but international postage will push the price up to around £25. UK Customs waive any customs charges on the personal import by post of any item (including postage) costing less than £18. Over that and you will be liable for import duty on the item and VAT on the item, the import duty and the postage.
Now, you might get away with it for one pair of gloves coming through the post, but you will almost certainly get hit if you are importing more than one pair.
Mike